Extension table



Dec. 12, 1933. J. COOPER 1,938,893

EXTENS ION TABLE Filed Aug. 23, 1955 2 Sheets-Sheet l INVENTOR ATTORNEY Dec. 12, 1933. J. COOPER 1,938,893

EXTENSION TABLE Filed Aug. 23, 1933 2 Sheets- Sheet 2 ATTORN EY Patented Dec. 12, 1933 UNITED STATES PATENT OFFICE 6 Claims.

The present invention relates to extension tables and more particularly to slide mechanism and controls therefor whereby extension of the table may be secured by moving outwardly a leaf g or leaves from a position under the table, the slides and associate features being arranged to hold the extension leaf in proper position when the leaf at its outermost position is raised and given a slight inward movement.

I. The invention also incorporates means for adjusting the elevation of the extension leaf or leaves so that they may be brought in exact register, as to height, with the main supporting surface of the table, such adjusting means compensating for warpage of the extension leaf in certain cases.

The invention will be described with reference to the accompanying drawings in which:

Fig. 1 is a transverse sectional elevation on the line l--1, Fig. 2, showing in dottedlines the position of two extension leaves, when extended.

Fig. 2 is a bottom plan view of the table illustrated in Fig. 1, broken away centrally.

Fig. 3 is a transverse sectional elevation similar to Fig. 1, showing one leaf in extended and final position, and a second leaf in position either for movement under the main table top or upwardly into register with the latter.

Fig. 4 is an enlarged detailed view of that portion of the right-hand slide shown in Fig. 1 which carries the spring engaged cam arm, and, in addition, the main table top and its slide engaging bracket, the cam arm being in position of inaction, the slide moved to position underlying the main table top.

Fig. 5 is a view similar to Fig. 4, showing the slide and cam arm with the latter in position to hold the slide with its extension leaf elevated and rigidly maintained in contact with the main table top.

Fig. 6 is a view similar to Fig. 5 showing the position of the elements when the extension leaf is moved outwardly from its position shown in Fig. 5 to a position preparatory to moving the leaf under the main table top.

Fig. '7 is a longitudinal fragmentary section on the line 7-7, Fig. 5.

Referring to the drawings, it will be seen by references to Figs. 1 and 2, that the table comprises a main table top 1 below which are mounted blocks 1x, each secured to a transverse frame member 2 serving to support member 1, these frame members in conjunction with longitudinal frame members 3 being mounted on legs 4. V )5 It win he noted that the longitudinal frame members 3 are dropped a distance below the table top 1, which is true also of the transverse frame member 2, in order to afford a clearance for the extension leaves 5. In addition, each longitudinal frame member 3 is cut away at two 0 points as at a, Fig. '7, in order to afford clearances for the slides which carry extension leaves, there being, in the present embodiment, two slides for each leaf. The slides are all of the same construction and description of one slide will suffice 5 for the remaining three.

Reference to Fig. 7 will show that the slide 6 is formed with a normally vertical wall, lower and upper horizontal walls, the upper wall being provided with 2. depending vertical flange 63:.

Reference to Fig. 3 will show that flange 6a: is extended in four continuous sections, each section lying in a distinct position, the sections being indicated at b, c, d and e. Flange 6x serves as a member for mounting the slide upon a carrier, the carrier in the present embodiment, being a bracket 7 carried by table top 1, the bracket being formed with an appropriately shaped lower flange upon which rides flange 6a: of the slide.

Each slide 6 carries a cam arm 8 slotted at its 30 top to receive a headed stud 9 fixed to the slide, the cam arm projecting downwardly through a slot formed in the lower horizontal flange 6:02: of the slide. The cam arm is normally abutted against a wall of said opening in flange 6x3: of 5 the slide by means of a spring 10, one end of the spring engaging the cam arm and the opposite end being carried by the slide. The spring normally holds the cam arm in the angular position illustrated in Fig. 4.

Carried by cam arm 8, as by lug Sr, is an ad justable screw support 11, the upper end of which is adapted to bear against the lower surface of flange 6mm of the slide. By rotating adjustable holding screw 11 in the desired direction, the effective distance between flange 6x1: and the lower end of cam arm 83:, may be varied The operation of the table will now be described The extension leaves being contracted and lying under the table top as shown in Fig. 1, the two slides of either of the extension leaves may be held by their supporting brackets 7 with the brackets engaging section (1 of flange 6:11. The initial outward movement of an extension leaf, say the right-hand leaf, Fig. 1, which carries the slide shown in Figs. 4 to 7 inclusive, will result in initial movement substantially horizontally, or in the plane of the table top 1. When section 0 of flange Grreaches the bracket, however, the slide and the leaf will begin to drop and the outward movement will be continued until the extension leaf clears the top, as shown in Fig. 3. Before the extension leaf clears the table top however, the lower end of each cam arm 8, of each slide supporting the leaf, will meet a contact plate 12 and the cam arm will be swung against the tension of spring 10. It thus will be seen that when the extension leaf 5 is moved upwardly from its full-line position, Fig. 3, to dotted line position, the lower end of cam arm 8 will clear the contact plate and the spring will swing the cam arm to the position shown in Fig. 5, wherein extension leaf 5 lies in the plane of and in contact with the table top 1. The extension leaf in this position is supported first by the slide, the slide resting upon supporting-adjusting screw 11, carried in turn by cam arm 8, which rests upon contact plate 12 of the longitudinal frame member 3. Thus, it will be seen that if, for any reason, the extension leaf does not lie flush with the upper surface of the table top, rotation of the supporting-adjusting screw 11 will effect movement of the leaf to the proper position.

In returning the extension leaf ,to the position underlying the table top, the leaf is moved outwardly from the position of Fig. 5 to the position of Fig. 6, thus causing cam arm 8 to be swung upon its fulcrum stud against the tension of spring 10 until it lies in such position (Fig. 6) that lowering of the slide will dislodge it from the contact plate 12. In other words, when a downward movement is given to the extension leaf, the parts will assume the position shown in Fig. 3, and the leaf may then be moved inwardly from the position of Fig. 3 to the position of Fig. 1.

It will be understood that various modifications may be made in the form and arrangement of the elements shown in the embodiment illustrated in the drawings without departing from the spirit of the invention, for example, if the adjustablesupporting screw 11 is eliminated from the cam arm, the connection of the latter with the slide may be merely pivotal, the stud passing through a hole in the cam arm rather than a slot formed therein; what I claim and desire to secure by Letters Patent, being as follows:

1. In an extension table, a table top, an extension leaf adapted to lie under the table top, a frame supporting the table top, a slide carrying the extension leaf, 2. support for the slide of such form that when the leaf is extended the slide and leaf may be moved upwardly or downwardly with the support as a fulcrum,a cam arm carried by the slide and mounted for swinging movement thereon, a spring engaging the cam arm, and a second support upon which the cam arm is moved by the spring when the leaf is extended and moved upwardly.

2. In an extension table, a table top, an extension leaf adapted to lie under the table top, a frame supporting the table top, a slide carrying the extension leaf, a bracket member supporting the slide in such manner that when the leaf is extended the slide and leaf may be moved upwardly or downwardly with the bracket as a fulcrum, a cam arm carried by the slide and mounted for swinging movement thereon, and a spring carried by the slide and engaging the cam arm.

3. In an extension table, a table top, and extension. leaf adapted to lie under the table top, a frame supporting the table top, a slide carrying the extension leaf, a bracket member supporting the slide in such manner that when the leaf is extended the slide and leaf may be moved upwardly or downwardly with the bracket as a fullcrum, a cam arm carried by the slide and mounted for swinging movement thereon, a spring carried by the slide and engaging the cam arm, and means for adjusting the position of the cam arm on the slide.

4. In an extension table, a table top, an exten sion leaf adapted to lie under the table top, a frame supporting the table top, a slide carrying the extension leaf, a bracket member supporting the slide in such manner that when the leaf is extended the slide and leafmay be moved upwardly or downwardly with the bracket as a fulcrum, a cam arm formed with a slot, a stud carried by the slide and entering said slot serving as a fulcrum for the cam arm, a spring engaging the cam arm and an adjusting screw carried by the arm and engaging the slide whereby the position of the cam arm relatively to the slide may be adjusted.

5. A slide for extension tables comprising a metallic member having a flanged laterally extending wall adapted to be slidably mounted upon a bracket and. also formed with a laterally extending lower wall cut away to receive and permit swinging movement of a cam arm, a cam arm fulcrumed on the slide in a spring engaging the cam arm and carried by the slide.

6. A slide for extension tables comprising a metallic member having a flanged laterally extending wall adapted to be slidably mounted upon a bracket and also formed with a laterally extending lower wall cut away to receive and permit swinging movement of a cam arm, a cam arm fulcrumed. on the slide in a spring engaging the cam arm carried by the slide and an adjustable supporting screw carried by the cam arm and adapted to engage the lower flange.

JOSEPH COOPER. 

